JPH0796602A - Pressure pad for cleaning printer cylinder or the like and manufacture thereof - Google Patents

Abstract

PURPOSE:To enhance vibration absorption and noise absorption through viscosity and, at the same time, embody even cleaning by a method wherein sticky gel having viscoelasticity is provided within exterior material at the cleaning of a printer cylinder or the like by pressing cleaning cloth material against its surface. CONSTITUTION:The blanket cylinder cleaning device 2 of a printer has cleaning cloth 6 as cleaning cloth material, which is supplied and spread under tension between a feed roll 3 and a wind-up roll 4 so as to press the cleaning cloth 6 against a blanket cylinder 1 with a pressure pad 5. The pressure pad 5 is equipped with an exterior member 10, which is made of rubber material, has a semi-arcuate crosssectional form and is fixed to a pedestal 12 by a pad holder 13 together with a form retaining sheet 23. In addition, sticky gel having viscoelasticity is filled in an empty chamber 24 formed between the exterior member 10 and the pedestal 12. The exterior member 10 retains its form by being expanded with the sticky gel 11. The hardenesses of respective members 1, 10 and 11 are set to satisfy the following relation: the cylinder 1> the exterior member 10> the sticky gel 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device for a printing machine cylinder or the like, and more particularly, to a cleaning cloth material for wiping off ink, paper waste or the like adhering to a blanket cylinder of a printing machine with a cleaning cloth. The present invention relates to a pressure-bonding pad for pressing a cylinder onto a cylinder.

[0002]

2. Description of the Related Art Conventionally, as a cleaning device for a blanket cylinder of a printing machine, for example, one disclosed in Japanese Patent Publication No. 2-6629 is known.

This cleaning device is installed along the length direction parallel to the axis of the blanket cylinder of the printing machine, and the cleaning cloth supplied and stretched between the supply roll and the take-up roll expands. The member is pressed against the surface of the blanket cylinder, and the cleaning cloth wipes and removes ink, paper waste, and the like attached to the blanket cylinder. The inflatable member is formed of a rubber material or the like in a semicircular cross section and is fixed to the pad base. Therefore, a space is formed between the expansion member and the pad base on the back side of the expansion member. An air supply path is connected to the space, and the expansion member is expanded and contracted by supplying and discharging air to wash the cloth. It is designed to contact and release the blanket cylinder.

In this conventional blanket cylinder cleaning device for a printing machine, a nozzle for injecting a cleaning liquid composed of a solvent that dissolves ink, water or the like onto a cleaning cloth is provided near the expansion member. Further, at the time of cleaning, the cleaning cloth is continuously or intermittently supplied in the direction opposite to the rotation of the blanket cylinder.

[0005]

In the above-mentioned conventional blanket cylinder cleaning device for a printing press, since the expansion member having elasticity is expanded and held by the pressure of air, the shape retention force becomes low. For this reason, as shown in FIG. 5, the central portion of the expansion member P in the length direction with respect to the ideal pressing line L projects beyond both ends, and the pressing force of the expansion member P on the cleaning cloth is uneven. As a result, unevenness occurs in the wiping and cleaning of the blanket cylinder, resulting in a problem of poor cleaning performance.

In particular, if the cleaning liquid is repeatedly attached to the expansion member P after many years of use, the expansion member P is likely to expand. As a result, the nip width (the contact area between the thin lid surface and the cleaning cloth) and the nip pressure (the contact pressure on the right contact surface) start to differ from each other, and it is necessary to adjust each time.

Further, the cylinder rotates while the cleaning cloth is pressure-bonded by the expansion member, but since the cylinder has a gap for fitting a blanket or biting the paper, this gap is used as a pressure-bonding pad. A pulsating sound due to impact is generated when the vehicle passes. Since this pulsating sound is amplified or resonated in the air space inside the expansion member, it is inevitable that it becomes an unpleasant noise, and various unpleasant noises must be accepted during the work. Further, the vibration due to the above-mentioned impact may cause the solvent on the cylinder to be scattered on the paper and cause a print quality defect.

Further, although the cleaning cloth and the expansion member are pulled in the rotational direction by the friction caused by the cylinder rotation, the expansion member only passes through the internal air space,
Tensile deformation in the rotational direction at the surface friction portion of the expansion member is unavoidable, and uneven wiping occurs.

As another expansion member, there is a member formed into a tubular shape having elasticity so that air pressure is not supplied (see Japanese Utility Model Publication No. 4-44370). Due to the reaction force of the pressing, the ideal pressing line L is undulated in the length direction, and the same problem as described above occurs.

Furthermore, an experiment was carried out by a method of manufacturing by sealing a liquid such as water or oil instead of air inside the expansion member described above. In this case, since the surface of the expansion member and the liquid inside do not come into close contact with each other, the various problems described above cannot be completely solved, and in particular, in the case of a pressure-bonding pad in which a liquid is sealed, the liquid is splashed by the vibration in the gap. It has been newly found that the cylinder is separated from the cylinder without sticking to it. In addition, if the front side of the expansion member is damaged, liquid may leak, which may lead to an accident that stains around the cylinder.

The present invention has been made in consideration of the various circumstances as described above, and enhances the vibration absorbing property and the sound absorbing property due to viscosity,
To provide a pressure-bonding pad for cleaning a printing machine cylinder or the like, which has a stable pressing surface having resilience and shape retention and has high cleaning performance without causing unevenness in wiping and cleaning, and a manufacturing method thereof. Is an issue.

[0012]

In order to solve the above-mentioned problems, a pressure-bonding pad for cleaning a printing machine cylinder or the like according to the present invention is provided with a viscoelastic pressure-sensitive adhesive gel inside an outer cover member of the pressure-bonding pad. Consists of

In a preferred embodiment, the outer cover member is fixed so as to form an arcuate cross section on the surface of a pedestal arranged parallel to the axial direction of the printing press cylinder, and the adhesive gel is placed in the inner space of the outer cover member. Can be configured to be hermetically sealed, in which case the jacket member can be formed from a rubber sheet. Further, it is desirable to set the respective hardnesses in the relationship of printing machine cylinder> outer cover member> adhesive gel.

When manufacturing the pressure-bonding pad for cleaning the cylinder of the printing press having the above-mentioned structure, the adhesive gel is converted into a sol,
After injecting this sol from the injection port of the jacket member to the inside and sealing the injection port, an adhesive gel is molded while the shape of the sol is held by the jacket member, and the adhesive gel is sealed inside the jacket member. Can be adopted.

[0015]

According to the manufacturing method of the present invention, a sol is manufactured by heating, and the sol is injected from the injection port of the jacket member to the inside in the sol state. The sol may be injected using the unsealed portion as an injection port without partially sealing the existing jacket member. The sol is shaped according to the internal shape of the jacket member, and thus the adhesive gel is shaped according to the internal shape to manufacture a pressure-bonding pad.

According to the pressure-bonding pad of the present invention, the outer cover member has a higher adhesiveness to the inner surface due to the viscoelasticity of the adhesive gel, and is in a state of being elastically supported integrally from the inside. Therefore, when the pressure pad presses the cleaning cloth against the cylinder, it absorbs the shock, vibration or noise at the time of pressure contact or contact with the gap of the cylinder due to its adhesiveness and viscosity from the inside. To do. In addition, viscoelastic support from the inside prevents drawing deformation in the cylinder rotation direction, evenly presses the pressure-sensitive pad against the cleaning cloth even when the shape retention force is strong, and adheres even if the outer cover member is damaged. The gel is not scattered and leaked to the outside, and the washing is continued for a predetermined time.

According to the embodiment of the present invention, if the outer cover member fixed to the surface of the pedestal is partially opened, the outer cover member is completely sealed to the pedestal after injecting sol as an injection port. It is composed by using. In particular, since the outer cover member is a rubber sheet, it is closely adhered to and integrated with the adhesive gel inside. Further, when the respective hardnesses are set to satisfy the relationship of cylinder of printing press> outer cover member> adhesive gel, noise and vibration due to the gap portion of the cylinder are sequentially attenuated from the outer cover member and absorbed. Become.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a pressure pad for cleaning a cylinder of a printing press and a method for manufacturing the same according to the present invention will be described below with reference to FIGS.
It will be explained based on.

Blanket cylinder cleaning device 2 of printing machine
Is installed along the length direction of the blanket cylinder 1. A cleaning cloth 6 as a cleaning cloth material that is supplied and stretched between the supply roll 3 and the take-up roll 4 is bonded to the blanket cylinder 5 by the pressure pad 5. Pressed to 1. The pressure-bonding pad 5 includes an outer jacket member 10 formed of a rubber material or the like in a semicircular cross section, and the outer jacket member 10 is fixed to a pedestal 12 by a pad holder 13 and bolts 14, and an adhesive gel described later. 11 is sealed. In addition, the end portion in the length direction of the outer cover member 10 has substantially the same holder plate 15 and bolt 1
6 is fixed to the pedestal 12 and the injection port 1 is provided on the end surface of the pedestal 12.
7 is provided.

The supply roll 3 and the winding roll 4 have side plates 18
Is rotatably supported by a shaft and is rotatably driven by a driving unit (not shown).

The cleaning cloth 6 is made of a non-woven fabric or the like and has sufficient strength so as not to be broken even if it is pressed by the pressure bonding pad 5 and stretched on the supply roll 3 and the winding roll 4, and rubs against the blanket cylinder 1. Wear resistance so that it will not be damaged by
Equipped with a uniform absorptivity that can evenly absorb a cleaning liquid such as a solvent or water. In addition, the cleaning cloth 6 is the side plate 1
Guide plate 2 which is installed on 8 and fixed to main stay 19
It is designed to be stretched by being guided by 0.

The outer cover member 10 is made of an elastic rubber material and is formed into a curved sheet shape having a desired strength, and flanges 21 and ribs 22 protruding outward are provided at both ends in the width direction. it can. Further, the curved shape is gradually reduced at both ends in the length direction of the jacket member 10 and is fixed to the holder plate 15 in a flat state. The jacket member 10 is molded in a range of JIS rubber hardness of about 50 ° or less, preferably about 40 ° or less. Further, the pedestal 12 is formed into a long trapezoid so that the pressure bonding pad 5 can be fitted thereto to form the air chamber 24 in an airtight manner, and is fixed to the main stay 19.

The pad holder 13 is provided with a groove 25 with which the flange 21 of the jacket member 10 engages, and is fixed to the pedestal 12 by bolts 14 via the jacket member 10. Further, the pad holder 13 also fixes the shape-retaining sheet 23 that is placed on the outside of the outer covering member 10. The shape-retaining sheet 23 can be composed of a non-stretchable hard thin sheet in which the surface of the glass wool fabric is coated with Teflon, and the expanded outer cover member 10 is formed.
It is designed to be able to wrap and retain shape. The shape retaining sheet 23 may be omitted.

Next, an adhesive gel 11 having viscoelasticity is filled in the vacant chamber 24 formed between the pedestal 12 on the back side of the outer jacket member 10 and the outer jacket member 10 is expanded by the adhesive gel 11. The shape is retained.

Examples of the adhesive gel 11 include those obtained by adding a curing agent and a tackifier to a base material of polyethylene gel or silicon gel and mixing them to form a gel. The pressure-sensitive adhesive gel 11 has a hardness C = 8 ° (Japan Rubber Association SRIS0101) or less, preferably a hardness C = 4 ° or less. As a specific example, the tensile strength is 7.9 Kgf / cm ²
(JIS K 6301, tensile speed 500 mm / min), elongation 1300% or more
(JIS K 6301, tensile speed 500 mm / min), tensile stress 0.1 to
0.2Kgf / cm ² (JIS K 6301, tensile speed 500mm / min tensile stress 50 to 400%), impact resilience 25% Kgf / cm ² (JIS K 6301, iron bar free fall from 100m pointer position) Those that have are used. In this embodiment, the trade name "Cosmogel" (manufactured by Cosmo Keiki Co., Ltd.) or the like is preferably used.

In this embodiment, a nozzle 11 for injecting a cleaning liquid composed of a solvent, water or the like is provided, and the pressure-bonding pad 5 has the outer cover member 10 always expanded and held in shape by the adhesive gel 11. The side plate 18 (that is, the pressure bonding pad 5) is brought close (state of FIG. 1) and separated (state of FIG. 3) from the blanket cylinder 1 by a drive unit such as a cylinder and a motor and gear (not shown), and a blanket of the cleaning cloth 6 is obtained. The cylinder 1 is pressed and released.

Next, a method of manufacturing the crimp pad 5 according to this embodiment will be described.

Preliminary polyethylene gel is about 110 ° C.
What is sol-ized by heating at around 160 ° C., preferably 120 ° C. to 150 ° C. is injected into the internal space 24 between the pedestal 12 and the jacket member 10 in the sol state. Injection
The existing inlet 17 by utilizing a plunger such as injection apparatus is pressed by 0.4Kg / cm ² ~0.5Kg / cm ² pressure of about, to a state bulging from dented jacket member 10 state semicircular Continued. That is, the sol is filled with the swelled internal space of the outer cover member 10 partitioned by the pedestal 12 in a shaped state. Since the sol contracts by cooling, a volume capable of compensating for the contraction is injected. In addition,
It is desirable that the inlet 17 and the air hole (not shown) are sealed so as not to backflow.

When the mixture is cooled after the injection, the sol shifts to gelation and the adhesive gel 11 is molded while being shaped in the internal space 24. The adhesive gel 11 is tightly integrated with the inner surface of the outer cover member 10 to be tightly sealed.

According to this manufacturing method, the existing injection port 17 is used.
Can be used as the sol injection port, and the sol may be injected using the unsealed portion as the injection port without partially sealing the holder plate 15 of the existing jacket member. Reference numeral 24 is a mold molding space, which allows the adhesive gel to be quickly adapted to the internal shape. At this time, it is desirable to provide an air hole (not shown) in advance, and at the same time as the injection, the internal air is leaked and the air is ejected while expelling the air.

Using the crimp pad 5 of this embodiment,
It is felt that vibration and noise are at a low level. This is because the hardness of the three members is such that the surface hardness of the blanket cylinder 1 is about 60 °> the hardness of the jacket member 10 is 40 °> the hardness of the adhesive gel 11 is 4 °, so the noise, vibration or gripping of the blanket cylinder 1 The impact and the like at the time of contact will be sequentially attenuated and absorbed from the outer cover member 10 to the inside. Particularly, since the adhesive gel 11 that is integrally adhered to the inside of the outer cover member 10 has low viscoelasticity, a strong damping force can be exhibited.

In order to demonstrate the described vibration and noise reduction,
A vibration comparison test was performed between the pressure-bonded pad of this example manufactured by the above manufacturing method and the air-expanded rubber pad of the conventional example. The test method was to attach each cylinder cleaning device with each pad to the blanket cylinder of the offset rotary printing press, and place the vibrometer pickup in the center of each cleaning device.
With respect to the three directions of the pad contacting / separating X direction, the pad length Y direction, and the pad up / down Z direction, the pad is pressed against the blanket cylinder for cleaning (L ₁ ) and the pad is not cleaned for non-cleaning (L ₂ ). Was measured and the difference was calculated.

As a result, although a slight difference was observed in the X direction, it did not change so much in the Y direction, and a difference was found in the Z direction. At the vibration acceleration level in the Z direction, L ₁ −L ₂ = 96−7 for the air expansion rubber pad.
It was 5 = 21 dB. On the other hand, in the pressure-bonding pad of this one example, 93.6-75.8 = 17.8 dB, which was a difference of about 3.2 dB. In particular, it was found that the viscoelastic gel 11 has a large viscous damping force due to a large viscous damping coefficient in vibration, and the damping is remarkable especially in a high frequency region. The blanket cylinder of the offset rotary printing press described above has a small gap width, but it is extremely large in the case of a sheet-fed press, so the impact force applied to the pad is large and the difference between the vibration levels of the two is further amplified. Presumed to be. As the vibration level meter, VM-51 type manufactured by Rion Co., Ltd. was used.

Further, a noise comparison test between the pressure-bonding pad of this embodiment and the air expansion rubber pad of the conventional example was conducted in the same manner. The test method was to set a noise microphone at a position 10 cm away from the cylinder at the center of each cleaning device, and set the noise level (at frequency correction characteristic level A) at the time of non-cleaning when the pad was separated from the blanket cylinder (L _The measurement was performed from ₂ ) at the time of cleaning (L ₁ ) when pressure was applied.

As a result, in the air-expanded rubber pad, L ₂
→ L ₁ = 70 → 91.6 dB (max). On the other hand, in the pressure bonding pad, L ₂ → L ₁ = 70 → 80.8
dB (max), and a difference of about 10 dB was observed. As described above, it is assumed that the difference in the high frequency region will also increase. The noise level meter used was NL-14 precision type manufactured by Rion Co., Ltd.

In this embodiment, the semi-arcuate pressure-bonding pad 5 is illustrated and described, but the invention is not limited to this shape. Adhesive gel inside 1
The provision of 1 does not prevent the implementation. In addition to the blanket cylinder of the printing machine,
The same configuration can be applied to, for example, a deposit on a cylinder of a paper machine.

[0037]

As described above, in the printing machine cylinder and the like according to the present invention, since the pressure-bonding pad is expanded and shaped by the adhesive gel having viscoelasticity with high shape-retaining force, the pressing force of the pressure-sensitive adhesive pad against the cleaning cloth is increased. Is uniformized and unevenness does not occur in the wiping and cleaning of the cylinder, so that the cleaning performance is improved.

In addition, the adhesive gel is in close contact with the internal space of the pressure-bonding pad to prevent expansion and swelling of the outer covering member, and also to prevent deformation of the pressure-sensitive pad during cleaning due to the restoring force of the adhesive gel. Therefore, the pressure-bonding pad is always kept in an appropriate shape, and even if the cleaning liquid adheres, the cleaning performance is not deteriorated.

Further, since the adhesive gel has a high shock absorbing power and a damping force acts, various shocks are absorbed, the device is protected, and vibration and noise during cleaning are reduced.

Further, even if the pressing side of the pressure bonding pad is damaged, the adhesive gel does not scatter like a liquid,
This has the effect of preventing contamination of the surroundings of the cylinder and contraction of the crimping member due to expected leakage of the outer covering member.

Furthermore, according to the manufacturing method of the present invention,
The pressure-bonding pad can be molded by injecting the adhesive gel into the internal space using a molding die, and the outer cover member and the adhesive gel can be manufactured by integrally adhering them in the same shape.

[Brief description of drawings]

FIG. 1 is a sectional view of essential parts showing a cleaning state of a cleaning device for a blanket cylinder in which a pressure bonding pad for cleaning a printing machine cylinder or the like according to an embodiment of the present invention is assembled.

FIG. 2 is a perspective view of a main part of a pressure bonding pad for cleaning a printing machine cylinder and the like.

FIG. 3 is a cross-sectional view of a main part of FIG. 1 when not cleaning.

FIG. 4 is a side view showing the expanded and shape-retained state of the crimp pad of FIG.

FIG. 5 is a side view showing an inflated shape-retaining state of a conventional air-expanded rubber pad.

[Explanation of symbols]

 1 Blanket Cylinder 2 Blanket Cylinder Cleaning Device 3 Supply Roll 4 Winding Roll 5 Crimping Pad 6 Cleaning Cloth 10 Outer Cover Member 11 Adhesive Gel 17 Pouring Port 23 Shape-Retaining Sheet 24 Internal Space

Claims (5)

[Claims] 1. A printer cylinder for pressing a cleaning cloth material against a surface of a printer cylinder or the like for cleaning, wherein an adhesive gel having viscoelasticity is provided inside an outer cover member. Crimping pad for cleaning etc. 2. The jacket member is fixed so as to form a circular arc cross section on the surface of a pedestal arranged parallel to the axial direction of the cylinder, and the adhesive gel is sealed in the internal space of the jacket member. Item 1. A pressure-bonding pad for cleaning a printing machine cylinder or the like according to Item 1. 3. The pressure-bonding pad for cleaning a printing machine cylinder or the like according to claim 1, wherein the outer cover member is formed of a rubber sheet. 4. The pressure-bonding pad for cleaning a printing machine cylinder or the like according to claim 1, wherein the hardness has a relationship of cylinder> cover member> adhesive gel. 5. The adhesive gel is preliminarily converted into a sol, the sol is injected into the inside from an injection port of an outer cover member, the injection port is sealed, and the adhesive sol is retained while the shape of the sol is retained by the outer cover member. A method for producing a pressure-bonding pad for cleaning a printing machine cylinder or the like, which is formed by molding and sealing an adhesive gel inside a jacket member.